Electro De-Ionisation System

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ELECTRODEIONISATION • POST-RO POLISHING

Electro De-Ionisation System

Ahura Aqua integrates electro de-ionisation (EDI) as the final polishing stage downstream of reverse osmosis — for the continuous, chemical-free production of high-purity and ultra-pure water.

We specialise in EDI for pharmaceutical Purified Water & WFI pre-treatment and semiconductor & electronics ultra-pure water (UPW) — delivering consistent low-conductivity water without the chemical handling of a conventional mixed-bed DI.

WHERE WE APPLY IT

Built for Pharma PW / WFI & Semiconductor UPW

In validated pharmaceutical and semiconductor facilities, the chemical storage, neutralisation and regeneration downtime of a conventional mixed-bed DI are liabilities. EDI polishes RO permeate to high-resistivity water continuously, with no acid or caustic — the natural fit ahead of a PW / WFI loop or UPW distribution.

WHERE EDI FITS

RO PERMEATE → ULTRA-PURE WATER

WORKING PRINCIPLE

RESIN + ION-SELECTIVE MEMBRANES + DC FIELD

Dilute Compartments

RO permeate flows through mixed-bed resin packed between a cation-selective and an anion-selective membrane.

DC-Field Migration

An applied DC field drives cations toward the cathode and anions toward the anode into adjacent concentrate streams, flushed to drain.

In-Situ Regeneration

The same field splits a fraction of water into H⁺ & OH⁻ that continuously regenerate the resin — no chemicals, no downtime.

STANDARD FEATURES

F-01

Pressure Vessels

Stainless steel or rubber-lined mild steel.

F-02

Pre-Filtration

Cartridge / precoat ahead of the resin beds.

F-03

Three-Stage Resin

Cation, anion & mixed-bed polishing.

F-04

Regeneration Skid

Acid-caustic, external or in-situ.

F-05

PLC + Instrumentation

Online conductivity, optional silica / sodium.

2H₂O → H⁺ + OH⁻

The DC field splits water in-situ — resin stays permanently regenerated, no acid or caustic.

CONFIGURATION OPTIONS

Service Flow: 2.5–75 m³/hr

HIGHER HARDNESS • SILICA • BORON

Two-Stage (Fractional) EDI

Stage one removes strongly-ionised impurities such as hardness, lowering scaling potential; stage two runs at higher voltage & current to polish out silica & boron — raising product quality, hardness tolerance and reliability.

PHARMA / BIOMEDICAL

Hot-Water Sanitisable Modules

Hot-water sanitisable EDI modules are available for pharmaceutical & biomedical duties with stringent sanitisation requirements ahead of a PW / WFI loop.

WHY EDI OVER MIXED-BED DI

No Hazardous Chemicals

Eliminates the acid / caustic storage, handling & neutralisation of a conventional DI

Continuous Output

High-purity water with no interruption for resin regeneration.

Energy-Efficient

Electrical current is applied only where required across the stack.

Smaller Footprint

Lower lifecycle cost than an equivalent mixed-bed DI train.

STANDARD FEATURES

FLOW RATE RANGE

2 – 50 M³/hr

Per integrated train, scalable in parallel

PRODUCT CONDUCTIVITY

< 1 μS/cm

High-resistivity ultra-pure water

CHEMICAL REGENERATION

None

Continuous, regeneration-free operation

TYPICAL APPLICATIONS

PHARMACEUTICAL

Purified Water & WFI generation (post-RO polishing)

SEMICONDUCTOR

OSAT, electronics & solar wafer cleaning / rinsing (UPW)

POWER

High-pressure boiler feed water

GREEN HYDROGEN

Electrolyser feed water

FOOD & BEVERAGE

F&B and laboratory ultra-pure water

Looking to replace a chemically-regenerated DI train with continuous EDI?

We’ll specify the right EDI stage for your pharma PW / WFI or UPW system.

Careers

Ahura Aqua

"Sustainable water engineering"

ELECTRODEIONISATION • POST-RO POLISHING